CoSMed: a confidentiality-verified social media platform

Bauereiß, Thomas, Pesenti Gritti, Armando, Popescu, Andrei and Raimondi, Franco ORCID: https://orcid.org/0000-0002-9508-7713 (2018) CoSMed: a confidentiality-verified social media platform. Journal of Automated Reasoning, 61 (1-4) . pp. 113-119. ISSN 0168-7433 [Article] (doi:10.1007/s10817-017-9443-3)

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Abstract

This paper describes progress with our agenda of formal verification of information flow security for realistic systems. We present CoSMed, a social media platform with verified document confidentiality. The system’s kernel is implemented and verified in the proof assistant Isabelle/HOL. For verification, we employ the framework of Bounded-De- ducibility (BD) Security, previously introduced for the conference system CoCon. CoSMed is a second major case study in this framework. For CoSMed, the static topology of declas- sification bounds and triggers that characterized previous instances of BD Security has to give way to a dynamic integration of the triggers as part of the bounds. We also show that, from a theoretical viewpoint, the removal of triggers from the notion of BD Security does not restrict its expressiveness.

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